Right, right, right.
By the time it took to get all this information, your average backyard mechanic could have had the bolt replaced and a new nut put on.
It is no fun having a wheel come off while driving. It's bad for your car, and it's really bad for anybody who might be in the path of the rolling wheel. Talk about a liability nightmare!
BTW, I once saw a semi-trailer wheel come off as the truck was going about 60. The wheel went right through a trailer court, missing the mobile homes and somehow, by God's grace, passing by a toddler on a trike. It kept going pass the trailer park and bounced up on another highway, barely missing a car, and came to rest in a front yard. Anybody who has messed with truck wheels can appreciate the force behind such an object. A car wheel of say 40 pounds traveling at 30 or 40 mph is pretty deadly too.